What's the "most efficient" version of Opera out for TP?

[Will7272]

I've read a ton of posts about new versions of Opera on here, XDA, and a few other sites. I'm sorta confused about which is the best in terms of stability, speed, ease of use, etc.... What is everyone using now?

Also, I installed a newer version of Opera on my first TP. When I did, it did not install over the version that came with the original sprint rom. When I went to programs--->All programs, it would show 2 Opera icons in the list. What is the best way to remedy this. Any help would be greatly appreciated. Thanks in advance.